Theres a steep irony in someone doing government controlled work idealizing a system where the work they do would likely not exist. Who exactly would be mandating/funding the existence, operation, or regular testing of a sewage plant in an anarchist society?
Society is poorly designed in the general sense, sure. It could be vastly improved and people could have more liberty wrt a lot of things. But left to their own devices people on average would not choose to mandate water treatment. Even if they somehow did, providing no central system of oversight for making sure that it happens would all but guarantee it doesnt get accomplished.
Its ridiculous how many people take critical aspects of society for granted and assume they would continue to exist in a world where everyone does whatever the fuck they want without any central planning or control. In many places around the world people already dont have access to fresh/clean water for this exact reason…
Look at the libertarian experiments that have all failed spectacularly, like Grafton, NH. Mfs couldnt even agree to not feed the bears or dispose of their trash appropriately. And that doesnt require some massive infrastructure project to accomplish. The greater good often necessitates protecting people at large from their own stupidity, otherwise your liberties are diminished by your neighbor’s negligence